Electric Mean Squared Radii of Lambda(1405) in Chiral Dynamics

TL;DR

This paper calculates the electric mean squared radii of Lambda(1405) using chiral dynamics, revealing its extended structure as a K^- bound around a proton, differing from ordinary baryons.

Contribution

It provides a novel calculation of Lambda(1405)'s electric mean squared radius within the chiral unitary model, considering different structural interpretations.

Findings

Lambda(1405) has a negative and large electric mean squared radius.

Lambda(1405) exhibits a widely spread K^- around the proton.

Results suggest a distinct extended structure compared to ordinary baryons.

Abstract

The electric mean squared radii <r^2>_E of Lambda(1405) are calculated in the chiral unitary model. We describe the Lambda(1405) as a dynamically generated resonance fully in the octet meson and octet baryon scattering. We also consider ``Lambda(1405)'' as a bound state of KbarN. For the later ``Lambda(1405),'' we obtain negative and larger absolute value of electric mean squared radius than that of ordinary baryons, which implies that Lambda(1405) have structure of widely spread K^- around p.